Table 1.

Measurements of the conventional fluoroscopic technique (group 1) and the three-dimensional computer-assisted technique (group 2). The values are given as the mean and the standard deviation. Statistical significance was defined for *p ≤ 0.05; **p ≤ 0.0001

Measurement	Group 1	Group 2
Drilling attempts (no.)	4.8 ± 1.6	3.0 ± 0*
Precision: screw parallelism (points)	22.5 ± 1.5	24 ± 0*
Precision: triangular area (mm2)	54.8 ± 10.2	70.8 ± 5.1**
Fluoroscopic single shots (no.)	24.8 ± 9.1	200 ± 0**
Total operation time per procedure (min)	15.9 ± 2.7	38.3 ± 4.3**